Display exec error or exit information in the UI cloud shell. (#89)

Signed-off-by: Oleksandr Andriienko <oandriie@redhat.com>

cloud-shell/src/const.ts

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2020 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+
+export namespace ANSIControlSequences {
+    export const RESET_COLOR = '\u001b[0m'
+    export const RED_COLOR = '\u001b[31m'
+    export const GREEN_COLOR = '\u001b[32m'
+ }

cloud-shell/src/index.ts

@@ -11,7 +11,9 @@
 import { CloudShellTerminal, TerminalHandler } from "./terminal";
 import { JsonRpcConnection } from "./json-rpc-connection";
 import { GenericNotificationHandler } from "vscode-jsonrpc";
-import { MachineExec } from "./terminal-protocol";
+import { MachineExec, EXIT_METHOD, ERROR_METHOD, ExecExitEvent, ExecErrorEvent } from "./terminal-protocol";
+import { NotificationType } from 'vscode-ws-jsonrpc';
+import { ANSIControlSequences as CS } from './const';
 
 const terminalElem = document.getElementById('terminal-container');
 
@@ -33,7 +35,7 @@ rpcConnecton.create().then(connection => {
         const exec: MachineExec = {
             tty: true,
             cols: terminal.cols,
-            rows: terminal.rows,
+            rows: terminal.rows
         };
 
         connection.sendRequest<{}>('create', exec).then((value: {}) => {
@@ -67,6 +69,15 @@ rpcConnecton.create().then(connection => {
             }
         });
     });
+    const exitNotification = new NotificationType<ExecExitEvent, void>(EXIT_METHOD);
+    connection.onNotification(exitNotification, (event: ExecExitEvent) => {
+        terminal.sendLine(CS.GREEN_COLOR + "Process completed." + CS.RESET_COLOR)
+    });
+
+    const errorNotification = new NotificationType<ExecErrorEvent, void>(ERROR_METHOD);
+    connection.onNotification(errorNotification, (event: ExecErrorEvent) => {
+        terminal.sendLine(CS.RED_COLOR + 'Failed to create terminal. Error: ' + event.stack + CS.RESET_COLOR)
+    });
 }).catch(err => {
     console.log('Fatal. Unable to connect to container.', err);
 })

cloud-shell/src/terminal-protocol.ts

@@ -8,6 +8,9 @@
  *   Red Hat, Inc. - initial API and implementation
  */
 
+export const EXIT_METHOD: string = 'onExecExit';
+export const ERROR_METHOD: string = 'onExecError';
+
 export interface MachineIdentifier {
     machineName: string,
     workspaceId: string
@@ -22,6 +25,16 @@ export interface MachineExec {
     id?: number
 }
 
+export interface ExecExitEvent {
+    id: number;
+    code: number;
+}
+
+export interface ExecErrorEvent {
+    id: number;
+    stack: string;
+}
+
 export interface IdParam {
     id: number
 }